content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.observable.internal.operators;
  
  import static org.junit.Assert.assertTrue;
  
  import org.junit.Test;
  
  import io.reactivex.common.exceptions.TestException;
  import io.reactivex.common.functions.Function;
  import io.reactivex.observable.*;
  import io.reactivex.observable.subjects.PublishSubject;
  
  public class MaybeIsEmptyTest {
  
      @Test
      public void normal() {
          Maybe.just(1)
          .isEmpty()
          .test()
          .assertResult(false);
      }
  
      @Test
      public void empty() {
          Maybe.empty()
          .isEmpty()
          .test()
          .assertResult(true);
      }
  
      @Test
      public void error() {
          Maybe.error(new TestException())
          .isEmpty()
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void fusedBackToMaybe() {
          assertTrue(Maybe.just(1)
          .isEmpty()
          .toMaybe() instanceof MaybeIsEmpty);
      }
  
  
      @Test
      public void normalToMaybe() {
          Maybe.just(1)
          .isEmpty()
          .toMaybe()
          .test()
          .assertResult(false);
      }
  
      @Test
      public void emptyToMaybe() {
          Maybe.empty()
          .isEmpty()
          .toMaybe()
          .test()
          .assertResult(true);
      }
  
      @Test
      public void errorToMaybe() {
          Maybe.error(new TestException())
          .isEmpty()
          .toMaybe()
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposedMaybeToSingle(new Function<Maybe<Object>, SingleSource<Boolean>>() {
              @Override
              public SingleSource<Boolean> apply(Maybe<Object> m) throws Exception {
                  return m.isEmpty();
              }
          });
      }
  
      @Test
      public void isDisposed() {
          PublishSubject<Integer> pp = PublishSubject.create();
  
          TestHelper.checkDisposed(pp.singleElement().isEmpty());
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeMaybeToSingle(new Function<Maybe<Object>, Single<Boolean>>() {
              @Override
              public Single<Boolean> apply(Maybe<Object> f) throws Exception {
                  return f.isEmpty();
              }
          });
      }
  
      @Test
      public void disposeToMaybe() {
          TestHelper.checkDisposedMaybe(new Function<Maybe<Object>, Maybe<Boolean>>() {
              @Override
              public Maybe<Boolean> apply(Maybe<Object> m) throws Exception {
                  return m.isEmpty().toMaybe();
              }
          });
      }
  
      @Test
      public void isDisposedToMaybe() {
          PublishSubject<Integer> pp = PublishSubject.create();
  
          TestHelper.checkDisposed(pp.singleElement().isEmpty().toMaybe());
      }
  
      @Test
      public void doubleOnSubscribeToMaybe() {
          TestHelper.checkDoubleOnSubscribeMaybe(new Function<Maybe<Object>, Maybe<Boolean>>() {
              @Override
              public Maybe<Boolean> apply(Maybe<Object> f) throws Exception {
                  return f.isEmpty().toMaybe();
              }
          });
      }
  }
  